Compared to the density of water, our Earth averages about
A) the same density, similar to Saturn.
B) 3 times denser, much like our Moon.
C) 4 times denser, similar to Mars.
D) 5 times denser, like the Mercury and Venus.
E) 10 times denser, due to our core of iron and nickel.
D
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Classical Greek astronomers believed the motions of the heavens could be described by uniform circular motion
Indicate whether the statement is true or false
A concave mirror has a radius of curvature of 1.0 m. An object is placed 2.0 m in front of the mirror. Determine the location of the image (in cm)
a. 130 b. 83 c. 67 d. 150 e. 200
A(n) ______________ consists of many narrow parallel slits very close together
Fill in the blank(s) with correct word
The magnetic force on a charged particle is always:
a. perpendicular to the particle's velocity. b. in the direction of the particle's velocity. c. absent for moving particles. d. parallel to the particle's velocity. e. in the opposite direction to the particle's velocity.